JP6846295B2 - ガスエンジン用潤滑油組成物、及び燃料消費量の改善方法又は異常燃焼の低減方法 - Google Patents
ガスエンジン用潤滑油組成物、及び燃料消費量の改善方法又は異常燃焼の低減方法 Download PDFInfo
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Description
[2]組成物中のマグネシウムサリシレート系清浄剤のマグネシウム元素換算の含有量に対する、組成物中のカルシウムサリシレート系清浄剤のカルシウム元素換算の含有量の比が1.50〜1.80である、[1]に記載のガスエンジン用潤滑油組成物。
[3]100℃における動粘度が10〜12mm2/sである、[1]又は[2]に記載のガスエンジン用潤滑油組成物。
[4]酸化防止剤及び無灰分散剤からなる群より選ばれる少なくとも1種をさらに含有する、[1]〜[3]のいずれかに記載のガスエンジン用潤滑油組成物。
[5][1]〜[4]のいずれかに記載のガスエンジン用潤滑油組成物を用いて潤滑を行う、燃料消費量の改善方法又は異常燃焼の低減方法。
[6]組成物のガスエンジン用潤滑油としての使用であって、組成物が、潤滑油基油と、構成元素としてリンを含み、かつ硫黄を含まない摩耗防止剤と、有機モリブデン系摩擦調整剤と、カルシウムサリシレート系清浄剤と、マグネシウムサリシレート系清浄剤と、を含有し、組成物中のマグネシウム元素含有量に対する組成物中のカルシウム元素含有量の比が1.50〜1.80であり、JIS K2272に準拠して測定される硫酸灰分量が0.6質量%以下である、使用。
[7]組成物のガスエンジン用潤滑油の製造のための使用であって、組成物が、潤滑油基油と、構成元素としてリンを含み、かつ硫黄を含まない摩耗防止剤と、有機モリブデン系摩擦調整剤と、カルシウムサリシレート系清浄剤と、マグネシウムサリシレート系清浄剤と、を含有し、組成物中のマグネシウム元素含有量に対する組成物中のカルシウム元素含有量の比が1.50〜1.80であり、JIS K2272に準拠して測定される硫酸灰分量が0.6質量%以下である、使用。
潤滑油基油は、通常の潤滑油分野で使用される潤滑油基油を用いることができる。ここで、潤滑油基油としては、具体的には、鉱油系基油、合成系基油、又は両者の混合物が挙げられる。
潤滑油組成物は、構成元素としてリンを含み、かつ硫黄を含まない摩耗防止剤を含有する。このような摩耗防止剤を用いることによって、寿命特性を改善することができる。
潤滑油組成物は、有機モリブデン系摩擦調整剤を含有する。
潤滑油組成物は、カルシウムサリシレート系清浄剤と、マグネシウムサリシレート系清浄剤と、を含有する。
(実施例1、2及び比較例1〜4)
表1に示すように、実施例1、2及び比較例1〜4の潤滑油組成物をそれぞれ調製した。なお、潤滑油組成物の調製の際には、その100℃における動粘度が、10.2〜10.4mm2/sの範囲内になるように主に粘度指数向上剤の含有量を調整した。得られた潤滑油組成物について、各種試験を行った。
基油A−1:水素化精製鉱油(GpIII+)(YUBASE−6、40℃動粘度:36.1mm2/s、100℃動粘度:6.42mm2/s、粘度指数:131)
摩耗防止剤B−1:ジアルキルリン酸亜鉛(ZP)(城北化学工業株式会社製、商品名:DBP−Zn−50L、アルキル基:ブチル基、リン元素含有量:6.9質量%)
摩耗防止剤b−1:ジアルキルジチオリン酸亜鉛(ZDTP)(シェブロンオロナイト社製、OLOA 269RJ、アルキル基:n−オクチル基、リン元素含有量:7.1質量%)
摩擦調整剤C−1:モリブデン酸ジアルキルアミン塩(株式会社ADEKA製、サクラルーブ 710、アルキル基:トリデカニル基、モリブデン元素含有量:10質量%)
金属系清浄剤D−1:過塩基性カルシウムサリシレート(オスカ化学株式会社製、商品名:OSCA 463、カルシウム元素含有量:6.5質量%)
金属系清浄剤D−2:中性カルシウムサリシレート(オスカ化学株式会社製、商品名:LB 622、カルシウム元素含有量:1.8質量%)
金族系清浄剤D−3:マグネシウムサリシレート(オスカ化学株式会社製、マグネシウム元素含有量:2.1質量%)
無灰分散剤E−1:ポリアルケニルコハク酸イミド(シェブロンオロナイト社製、OLOA 5096、重量平均分子量:4000〜6000、窒素元素含有量:1.5質量%、ホウ素元素含有量:0.5質量%)
酸化防止剤F−1:アミン系酸化防止剤(BASF社製、商品名:IRGANOX L57、モノブチルフェニルモノオクチルフェニルアミン、窒素元素含有量:4.5質量%)0.3質量%(組成物全量基準)及びフェノール系酸化防止剤(BASF社製、商品名:IRGANOX L135、ヒンダードフェノール、窒素元素含有量:4.5質量%)0.3質量%(組成物全量基準)
粘度指数向上剤G−1:ポリメタクリレートとオレフィンコポリマーとの混合ポリマー(エボニックデグサ社製、商品名:VISCOPLEX 2−602)
JIS K2283「原油及び石油製品−動粘度試験方法及び粘度指数算出方法」に準拠して、各潤滑油組成物の40℃及び100℃動粘度並びに粘度指数を測定した。
JIS K2501に準拠して、各潤滑油組成物の酸価及び塩酸法による塩基価を測定した。
JIS K2272に準拠して、各潤滑油組成物の硫酸灰分量を測定した。
各潤滑油組成物について、NOx吹き込み試験を行った。試験条件を以下に示す。試験後、JIS K2501に準拠して、各潤滑油組成物の塩酸法による塩基価を測定し、試験前の塩基価に対する試験後の塩基価([試験後の塩基価]/[試験前の塩基価])を「NOx試験後塩基価残存率」として算出した。本試験においては、数値が大きい(例えば、10%以上)ほど、潤滑油組成物の塩基価が維持される、ずなわち、長寿命であることを意味する。
混合ガス:酸素(85%)、NO2(1000ppm)及び窒素(残部)の混合ガス
試験温度:140℃
試験時間:96時間
各潤滑油組成物について、シリンダオンディスク式往復動摩擦試験機を用いて、SRV試験を行い、金属間摩擦係数を測定した。試験条件を以下に示す。本試験においては、数値が小さい(例えば、0.15以下)ほど、摩擦特性に優れる、すなわち、省燃費性に優れることを意味する。
荷重:170N
振動数:50Hz
試験温度:80℃
試験時間:30分間
各潤滑油組成物について、高圧示差走査熱量計(高圧DSC)を用いて、熱量変化を測定し、DSCチャートの立ち上がり温度(onset)を酸化開始温度として評価した。試験条件を以下に示す。本試験においては、数値が大きい(例えば、270℃以上)ほど、酸化(すなわち、自己着火(燃焼)現象)が起こりにくいことを意味する。
測定雰囲気:空気雰囲気下
圧力:1.0MPa(10atm)
昇温条件:50℃で5分間保持した後、10℃/分で500℃まで昇温
Claims (4)
- 潤滑油基油と、
構成元素としてリンを含み、かつ硫黄を含まない摩耗防止剤と、
有機モリブデン系摩擦調整剤と、
カルシウムサリシレート系清浄剤と、
マグネシウムサリシレート系清浄剤と、
を含有し、
組成物中のマグネシウム元素含有量に対する組成物中のカルシウム元素含有量の比が1.50〜1.80であり、
組成物中の前記マグネシウムサリシレート系清浄剤のマグネシウム換算の含有量をC(Mg)、組成物中の前記カルシウムサリシレート系清浄剤のカルシウム元素換算の含有量をC(Ca)としたとき、C(Mg)に対するC(Ca)の比が1.50〜1.80であり、C(Mg)とC(Ca)との総量が800〜1500質量ppmであり、
JIS K2272に準拠して測定される硫酸灰分量が0.6質量%以下である、
ガスエンジン用潤滑油組成物。 - 100℃における動粘度が10〜12mm2/sである、
請求項1に記載のガスエンジン用潤滑油組成物。 - 酸化防止剤及び無灰分散剤からなる群より選ばれる少なくとも1種をさらに含有する、 請求項1又は2に記載のガスエンジン用潤滑油組成物。
- 請求項1〜3のいずれか一項に記載のガスエンジン用潤滑油組成物を用いて潤滑を行う、
燃料消費量の改善方法又は異常燃焼の低減方法。
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